package servlet;

import pojo.User;
import service.UserService;
import service.impl.UserServiceImpl;
import util.Page;

import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
import java.util.List;


// 注解
@WebServlet(urlPatterns = "/user")
public class UserServlet extends HttpServlet {

    @Override
    protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        doPost(req, resp);
    }

    @Override
    protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        UserService userService = new UserServiceImpl();
        req.setCharacterEncoding("UTF-8");
        String action = req.getParameter("action");
        if("list".equals(action)){
            // 拿到网页传递过来的用户名和密码
            String name = req.getParameter("name");
            String pass = req.getParameter("pass");

            String currentPage = req.getParameter("currentPage");

            if(currentPage==null){
                currentPage="1";
            }
            int int_currentPage = Integer.parseInt(currentPage);
            Page page = new Page();
            User condition = new User(name,pass);
            //查询总记录数
            int totalCount=userService.count(condition);
            //绑定page相关参数
            page.setTotalCount(totalCount);
            page.setCurrentPage(int_currentPage);
            page.setTotalPage();
            //计算偏移量
            int offset = (int_currentPage-1)*page.getPageSize();



            List<User> users = userService.findAll(condition,offset,page.getPageSize());
            // 存储对象到作用域中
            req.setAttribute("users", users);
            req.setAttribute("user", condition);
            // 跳转到对应的视图显示数据
            req.getRequestDispatcher("/index.jsp").forward(req, resp);
        } else if ("delete".equals(action)){
            // 拿到网页传递过来的用户名和密码
            String sid = req.getParameter("id");
            int id = Integer.parseInt(sid);
            int result = userService.deleteUser(id);
            // 重定向
            resp.sendRedirect("user?action=list");
        } else if("add".equals(action)){
            // 拿到网页传递过来的用户名和密码
            String name = req.getParameter("name");
            String pass = req.getParameter("pass");
            int result = userService.addUser(new User(name,pass));
            // 重定向
            resp.sendRedirect("user?action=list");
        } else if("toupdate".equals(action)){
            String sid = req.getParameter("id");
            int id = Integer.parseInt(sid);
            User user = userService.findUserById(id);

            // 存储对象到作用域中
            req.setAttribute("user", user);
            // 跳转到对应的视图显示数据
            req.getRequestDispatcher("/update.jsp").forward(req, resp);
        } else if("update".equals(action)){
            String sid = req.getParameter("id");
            int id = Integer.parseInt(sid);
            // 拿到网页传递过来的用户名和密码
            String name = req.getParameter("name");
            String pass = req.getParameter("pass");
            int result = userService.updateUser(new User(id,name,pass));
            // 重定向
            resp.sendRedirect("user?action=list");
        }
    }
}
